posix: fix misuse of bool (invalid code in c23)

a bool pointer argument cannot take true or false but either &boolval
or NULL

Author: crrodriguez

ext/posix/posix.c

@@ -508,7 +508,7 @@ PHP_FUNCTION(posix_isatty)
 			RETURN_FALSE;
 		}
 	} else {
-		if (!zend_parse_arg_long(z_fd, &fd, /* is_null */ false, /* check_null */ false, /* arg_num */ 1)) {
+		if (!zend_parse_arg_long(z_fd, &fd, /* is_null */ false, /* check_null */ NULL, /* arg_num */ 1)) {
 			php_error_docref(NULL, E_WARNING, "Argument #1 ($file_descriptor) must be of type int|resource, %s given",
 				zend_zval_value_name(z_fd));
 			fd = zval_get_long(z_fd);